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Stockholders' Equity (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			3 Months Ended		6 Months Ended						3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			6 Months Ended				6 Months Ended				6 Months Ended				6 Months Ended
	Jul. 31, 2012	Apr. 30, 2012	Feb. 29, 2012	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 15, 2012	Mar. 27, 2012	Mar. 16, 2012	Dec. 31, 2011	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Restructuring Charges [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] Restructuring Charges [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member]	Jun. 30, 2012 Stock Appreciation Rights (SARs) [Member] General and Administrative Expense [Member]	Jun. 30, 2012 2012 Three-year PSU Awards [Member]	Mar. 27, 2012 2012 Three-year PSU Awards [Member]	Jun. 30, 2012 2012 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2012 2012 Three-year PSU Awards [Member] Minimum [Member]	Jun. 30, 2012 2011 Three-year PSU Awards [Member]	Mar. 11, 2011 2011 Three-year PSU Awards [Member]	Jun. 30, 2012 2011 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2012 2011 Three-year PSU Awards [Member] Minimum [Member]	Jun. 30, 2012 2010 Three-year PSU Awards [Member]	Mar. 08, 2010 2010 Three-year PSU Awards [Member]	Jun. 30, 2012 2010 Three-year PSU Awards [Member] Maximum [Member]	Jun. 30, 2012 2010 Three-year PSU Awards [Member] Minimum [Member]	Jun. 30, 2012 2012 CEO Incentive Compensation [Member]	Mar. 27, 2012 2012 CEO Incentive Compensation [Member]	Jun. 30, 2012 2012 CEO Incentive Compensation [Member] Maximum [Member]	Jun. 30, 2012 2012 CEO Incentive Compensation [Member] Minimum [Member]	Dec. 31, 2012 SLO Awards [Member]	Jun. 30, 2012 SLO Awards [Member]	Mar. 09, 2012 SLO Awards [Member]	Dec. 31, 2011 SLO Awards [Member]
Stockholders' Equity (Textual) [Abstract]
Targeted number of common stock shares to be earned under the performance incentive plan																414,226				380,617				413,642				273,834
Targeted number of common stock shares to be earned under the performance incentive plan for adjusted EBITDA goal																												150,855
Aggregate increase or decrease in the number of shares earned for all participants based on the performance																41,423				38,062				41,364
Shares to be issued as a percentage of target shares under the performance incentive plan																		200.00%	0.00%			200.00%	0.00%			200.00%	0.00%			200.00%	0.00%
Per share price of common stock																	$ 19.72				$ 26.18				$ 20.88
Valuation Per Share									$ 23.40
Target level for the determination of performance goals and measures																100.00%				84.00%				97.00%
Target level for the determination of performance goals and measures for adjusted EBITDA goal																												79.00%
Maximum level for the determination of performance goals and measures																								159.00%
Targeted number of common stock shares to be earned under the performance incentive plan at ROIC target level																414,226				159,859				200,616
Common stock share price on grant date																													$ 19.72
Share based compensation stock award premium																																25.00%			25.00%
Restricted stock shares and restricted stock units included in SLO Award target																																	77,731	11,212
Targeted number of common stock shares to be earned under performance incentive plan at volume target level																				125,604				328,845
Percentage targeted number of common stock shares net of forfeiture related to volume goal																				66.00%
Compensation expense												$ 1	$ 8	$ (9)	$ 3
Payment due to exercise SARs													18		22
Liability for SARs												0.1	0.1	27.0	27.0
Target level for determination of net debt reduction goals measures																												100.00%
Targeted number of common stock shares to be earned for net debt reduction goals																												82,150
Additional Stockholders' Equity (Textual) [Abstract]
Dividends declared per common share	$ 0.13	$ 0.13	$ 0.13			$ 0.13
Estimated dividend payment	25
Common stock issued	194,000,000			204,179,917		204,179,917					202,528,616
Common stock outstanding	194,000,000			194,120,605		194,120,605					192,062,185
Available cash to pay cash dividend								25		25
Liability for SARs												0.1	0.1	27.0	27.0
Dividends paid per common share				$ 0.13	$ 0.13	$ 0.26	$ 0.26
Cash dividend paid of current quarter in available cash						$ 50.4	$ 41.6